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Manual 238-44943-00D
Flammable Vapor Ignition
Resistant Water Heaters
Gas Water Heaters
SERVICE
MANUAL
Troubleshooting Guide
and Instructions for Service
(To be performed ONLY by
qualified service providers)
For the Bradford White
Defender Safety System
Models:
MI30T*F(BN,CX,SX)
MI30S*F(BN, CX,SX)
MI303T*F(BN,CX,SX)
MI40T*F(BN,CX,SX)
MI403S*F(BN,CX,SX)
MI404T*F(BN,CX,SX)
MI503*F(BN,CX,SX)
MI50L*F(BN,CX,SX)
MI504S*F(BN,CX,SX)
MI60T*F(BN,CX,SX)
C(S,D)W2504T*F(BN,CX,SX)
Save this manual for future reference
FEATURING
®
M430T*F(BN,CX,SX)
M440T*F(BN, CX,SX)
M4403S*F(BN,CX,SX)
M4503*F(BN,CX,SX)
M460T*F(BN,CX,SX)
M1XR403S*F(BN,CX,SX)
M1XR504T*F(BN,CX,SX)
M2XR504T*F(BN,CX,SX)
M2XR65T*F(BN,CX,SX)
M2C504T*F(BN,CX,SX)
50T65F(B*N,C*X,S*X)
65T65F(B*N,C*X,S*X)
(*) Denotes Warranty Years
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Table of Contents
Related Manuals for Bradford White MI30T
Summary of Contents for Bradford White MI30T
- Page 1 Resistant Water Heaters Gas Water Heaters SERVICE MANUAL Troubleshooting Guide and Instructions for Service (To be performed ONLY by qualified service providers) FEATURING For the Bradford White ® Defender Safety System Models: MI30T*F(BN,CX,SX) M430T*F(BN,CX,SX) MI30S*F(BN, CX,SX) M440T*F(BN, CX,SX) MI303T*F(BN,CX,SX) M4403S*F(BN,CX,SX)
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Page 2: Table Of Contents
The Bradford White DEFENDER Safety System ® Flammable Vapor Ignition Resistant Water Heaters Table of Contents Page Service Procedure Introduction - - - Trouble shooting Chart - - - Inner Door Gasket Removal, Inspection, Replacement and Installation RG-I Thermocouple/Thermopile Testing and Replacement... -
Page 3: Introduction
The following information will instruct service professionals on the function, proper diagnosis and repair of water heaters employing the Bradford White DEFENDER Safety System. How the Safety System Works During normal operation, air for combustion is drawn into the water heater through the opening in the jacket. -
Page 4: Trouble Shooting Chart
White Rodgers/Robertshaw Gas Valve Troubleshooting Chart Flammable Vapor Ignition Resistant Water Heaters SERVICE SYMPTOM PROBABLE CAUSE CORRECTIVE ACTION PROCEDURE 1. Turn on gas supply and/or check line 1. See Service Procedure 1. No incoming gas or too low gas pressure. RG-V, Page 12. - Page 5 Honeywell Gas Control Troubleshooting Chart Flammable Vapor Ignition Resistant Water Heaters Observe green LED indicator on Gas Control. Error flash codes are displayed with a three second pause before repeating. Check and repair the system as noted in the Green LED Indicator troubleshooting table below.
- Page 6 Honeywell Gas Control Troubleshooting Chart Flammable Vapor Ignition Resistant Water Heaters Observe green LED indicator on Gas Control. Error flash codes are displayed with a three second pause before repeating. Check and repair the system as noted in the Green LED Indicator troubleshooting table below.
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Page 7: Inner Door Gasket Removal, Inspection, Replacement And Installation
SERVICE PROCEDURE RG-I The Bradford White Inner Door/Gasket Removal, Inspection DEFENDER Replacement and Reinstallation ® Safety System For Honeywell Control, rotate knob counter-clockwise to the “OFF” position. Inner Door Removal Procedure Step 1. Rotate knob of the combination thermostat/gas valve to the “OFF” position. - Page 8 SERVICE PROCEDURE RG-I Inner Door/Gasket Removal, Inspection Replacement and Reinstallation GASKET OVERLAP MUST RECOMMENDED PATTERN BE AS SHOWN ENLARGED FOR RTV SEALANT ±1/32" VIEW OF FLANGE AREA PLACE FLANGE SECTIONS FIRST VIEW WITH GASKETS IN PLACE EXPANDED VIEW Installation of Inner Door With Gasket. WARNING Step 7.
- Page 9 SERVICE PROCEDURE RG-I Inner Door/Gasket Removal, Inspection Replacement and Reinstallation Step 10. Firmly place right side inner door flange against the left side inner door flange and secure with (2) hex drive screws from step 3c. DO NOT OVER TIGHTEN SCREWS. Step 11.
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Page 10: Thermocouple/Thermopile Testing And Replacement
SERVICE PROCEDURE RG-II The Bradford White DEFENDER Thermocouple/Thermopile Testing and Replacement Safety System ® CLOSED CIRCUIT THERMOCOUPLE TESTING (White Rodgers Control) Step 1. Closed circuit testing is the preferred method for testing thermocouple. Following the lighting instruction label on the heater, proceed to light the pilot and allow to operate for three minuets. If the pilot will not stay lit, hold the pilot button (located on the combination thermostat/gas valve) down during this test Step 2. - Page 11 SERVICE PROCEDURE RG-II Thermocouple/Thermopile Testing and Replacement OPEN CIRCUIT THERMOCOUPLE TESTING (White Rodgers/Robertshaw Gas Valve) Step 1. Disconnect thermocouple from combination thermostat/gas valve. Step 2. Using a multimeter capable of measuring millivolts, connect one alligator clip to the end ball or contact portion of the thermocouple, and the other alligator clip to copper portion of the thermocouple.
- Page 12 SERVICE PROCEDURE RG-II Thermocouple/Thermopile Testing and Replacement OPEN CIRCUIT THERMOPILE TESTING (Honeywell Gas Control) The following test should be performed while the pilot flame is on. Step 1. Turn knob to pilot position and depress. Step 2. Continue pressing knob and remove red (+) wire from resettable thermal door switch. Step 3.
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Page 13: Pilot Assembly Inspection Cleaning And Replacement
The Bradford White SERVICE PROCEDURE RG-III DEFENDER Pilot Assembly Inspection, Cleaning and Replacement Safety System ® PILOT/ELECTRODE ASSEMBLY INSPECTION, For Honeywell Control, rotate knob counter-clockwise to the CLEANING AND REPLACEMENT “OFF” position. Step 1. Turn off gas supply to water heater. Rotate knob... -
Page 14: Piezo Igniter, Electrode Testing And Replacement
The Bradford White SERVICE PROCEDURE RG-IV Piezo Igniter, Electrode Testing DEFENDER and Replacement ® Safety System PIEZO IGNITER, ELECTRODE TESTING AND REPLACEMENT With the pilot not in operation (no pilot flame) you can check the Piezo and electrode circuit by viewing pilot thru the sight glass located on the inner door and observing the spark action. -
Page 15: White Rodgers/Robertshaw Gas Valve Testing And Replacement
The Bradford White SERVICE PROCEDURE RG-V DEFENDER Gas Valve Testing and Replacement (White Rodgers/Robertshaw) Safety System ® Gas Valve Testing and Replacement (White Rodgers/Robertshaw) The gas valve is a non repairable device. If trouble shooting has determined a problem with the gas valve, it must be replaced. - Page 16 SERVICE PROCEDURE RG-V Gas Valve Testing and Replacement (White Rodgers/Robertshaw) THERMOCOUPLE TESTING See SERVICE PROCEDURE RG-II MAGNET ASSEMBLY TESTING (White Rodgers Control) Step 1. Following the lighting instruction label on the heater, proceed to light the pilot and allow to operate for three minuets.
- Page 17 SERVICE PROCEDURE RG-V Gas Valve Testing and Replacement (White Rodgers/Robertshaw) ECO (Energy Cut Off) TESTING Step 1. Disconnect thermocouple from gas valve. Step 2. Using a multimeter capable of measuring Ohms (or continuity), attach one lead (alligator clip) to the pilot tube. Insert the other lead (probe) fully into the magnet opening, Be sure the probe makes contact only at the top center of the magnet opening.
- Page 18 SERVICE PROCEDURE RG-V Gas Valve Testing and Replacement (White Rodgers/Robertshaw) Step 7. Removal of gas valve. a) Disconnect main burner feedline, pilot tube and thermocouple from gas valve & remove burner from combustion chamber. NOTE: Feed line nut for natural gas control uses right hand threads, LP control uses left hand thread.
- Page 19 SERVICE PROCEDURE RG-V Gas Valve Testing and Replacement (White Rodgers/Robertshaw) Step 9. Reinstallation of inner door assembly. (cont.) b) Clean any gasket residue or other debris from combustion chamber surface before installing the inner door/gasket assembly. c) Position thermocouple, pilot tube and Piezo wire against left side inner door flange gasket. DO NOT ROUTE THROUGH RADIUSED CHANNEL WITH FEEDLINE.
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Page 20: Honeywell Gas Control Testing, Disassembly, And Replacement
The Bradford White SERVICE PROCEDURE RG-VI DEFENDER Gas Control Testing, Disassembly & Replacement (Honeywell) Safety System ® Honeywell Gas Control Testing, Disassembly, and Replacement The Gas Control is made up of (5) major components; the control cover, the piezo igniter, the valve body, the temperature sensor, and the back plate. -
Page 21: Safety System
The Bradford White SERVICE PROCEDURE RG-VI DEFENDER Gas Control Testing, Disassembly & Replacement (Honeywell) Safety System ® MANIFOLD PRESSURE TESTING (this procedure presumes a maximum line pressure of 14.0" w.c.) Step 1. Set the Gas Control to the “OFF” position. -
Page 22: Temperature Sensor Testing
The Bradford White SERVICE PROCEDURE RG-VI DEFENDER Gas Control Testing, Disassembly & Replacement (Honeywell) Safety System ® TEMPERATURE SENSOR TESTING CAUTION DO NOT use standard multimeter probes for this test. If Control has gone into lockout due to excessive Doing so will damage connector. Use special pin type... - Page 23 SERVICE PROCEDURE RG-VI The Bradford White DEFENDER Gas Control Testing, Disassembly & Replacement (Honeywell) Safety System ® WARNING Stored water may be HOT when performing the following steps in this procedure. Take necessary precaution to prevent personal injury. DETERMINE WATER TEMPERATURE INSIDE TANK...
- Page 24 The Bradford White SERVICE PROCEDURE RG-VI DEFENDER Gas Control Testing, Disassembly & Replacement (Honeywell) Safety System ® GAS CONTROL DISASSEMBLY/REASSEMBLY Step 1. Rotate knob of the Gas Control to the “OFF” position. Step 2. Turn off gas supply to water heater.
- Page 25 SERVICE PROCEDURE RG-VI The Bradford White DEFENDER Gas Control Testing, Disassembly & Replacement (Honeywell) Safety System ® GAS CONTROL DISASSEMBLY/REASSEMBLY Step 8. Disconnect temperature sensor from control board and remove wire from the temperature sensor wire routing clip. Temperature sensor...
- Page 26 The Bradford White SERVICE PROCEDURE RG-VI DEFENDER Gas Control Testing, Disassembly & Replacement (Honeywell) Safety System ® GAS CONTROL DISASSEMBLY/REASSEMBLY Step 10. Remove the valve body by removing screw located at the lower left corner then unclipping the lower right side from the backplate first followed by the lower left side using a flat head screwdriver.
- Page 27 The Bradford White SERVICE PROCEDURE RG-VI DEFENDER Gas Control Testing, Disassembly & Replacement (Honeywell) Safety System ® GAS CONTROL DISASSEMBLY/REASSEMBLY Step 12. Remove temperature sensor from insertion stick by pulling apart as illustrated below. Temperature sensor Pull in this direction...
- Page 28 The Bradford White SERVICE PROCEDURE RG-VI DEFENDER Gas Control Testing, Disassembly & Replacement (Honeywell) Safety System ® GAS CONTROL REPLACEMENT Rotate knob counter-clockwise to the “OFF” position. Step 1. Rotate knob of the Gas Control to the “OFF” position. Step 2. Turn off gas supply to water heater.
- Page 29 The Bradford White SERVICE PROCEDURE RG-VI DEFENDER Gas Control Testing, Disassembly & Replacement (Honeywell) Safety System ® GAS CONTROL REPLACEMENT Step 8. Install new Gas Control into water heater (contintued). b) Reattach main burner feedline, pilot tube, piezo igniter wire, inner door wire (red) and thermopile wire (white) to Gas Control.
- Page 30 The Bradford White SERVICE PROCEDURE RG-VI DEFENDER Gas Control Testing, Disassembly & Replacement (Honeywell) Safety System ® GAS CONTROL REPLACEMENT Step 9. Reinstallation of inner door assembly (continued). d) Firmly place right side inner door flange against the left side inner door flange and secure with (2) hex drive screws from step 6c.
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Page 31: Burner Operation Inspection, Adjustment, Cleaning And Replacement
Under no circumstances shall flammable materials be used or stored in the vicinity of the water heater. With the inner door removed the Bradford White Defender Safety System will be inactivated. If flammable vapors are present, a fire or explosion may result causing property damage, personal injury or death. - Page 32 SERVICE PROCEDURE RG-VII Burner Operation Inspection, Adjustment Cleaning and Replacement MAIN BURNER: Inspection, Adjustment, Cleaning and Replacement (cont.) Step 3. Fully inspect inner gasket per SERVICE PROCEDURE RG-I, step 4. Replace gasket if required following SERVICE PROCEDURE I, steps 5 & 6. Step 4.
- Page 33 SERVICE PROCEDURE RG-VII Burner Operation Inspection, Adjustment Cleaning and Replacement BURNER CLEANING (Cont.) Step 5. Disconnect (unscrew) Main burner (steel) from main burner orifice or on cast iron burners (“C” burner), loosen air shutter & disconnect (unscrew) feedline from burner. Step 6.
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Page 34: Resettable Thermal Switch Testing And Replacement
SERVICE PROCEDURE RG-VIII The Bradford White Resettable Thermal Switch DEFENDER Testing and Replacement Safety System ® RESETTABLE THERMAL SWITCH CONTINUITY TESTING Step 1. Remove outer jacket door. Step 2. Disconnect wire leads from resettable thermal switch. Step 3. Using a multimeter capable of measuring continuity (Ohms),... - Page 35 SERVICE PROCEDURE RG-VIII Resettable Thermal Switch Testing and Replacement RESETTABLE THERMAL SWITCH REPLACEMENT Step 1. Rotate knob of combination thermostat gas valve to the off position. For White Rodgers Control, depress knob slightly and rotate clockwise to the “OFF” position. For Honeywell Control, rotate knob counter-clockwise to the “OFF”...
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Page 36: Screenlok ® Flame Arrestor Cleaning
The Bradford White SERVICE PROCEDURE RG-IX ® DEFENDER ScreenLok Flame Arrestor Cleaning Safety System ® ScreenLok Flame Arrestor Cleaning ® Step 1. Rotate knob of combination thermostat gas valve to the off position. For White Rodgers Control, depress knob slightly and rotate clockwise to the “OFF”... -
Page 37: Dip Tube And Anode Inspection And Replacement
SERVICE PROCEDURE RG-X The Bradford White Dip Tube and Anode DEFENDER Inspection and Replacement Safety System ® DIP TUBE INSPECTION AND REPLACEMENT WARNING Heater components and stored water may be HOT when performing the following steps in this procedure. Take necessary precaution to prevent personal injury. - Page 38 SERVICE PROCEDURE RG-X Dip Tube and Anode Inspection and Replacement ANODE INSPECTION AND REPLACEMENT WARNING Heater components and stored water may be HOT when performing the following steps in this procedure. Take necessary precaution to prevent personal injury. Step 1. Turn off water supply to water heater.
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Page 39: Generic Parts List
The Bradford White DEFENDER Generic Parts List ® Safety System Draft Hood 16 Complete BN Burner Assembly (Natural) Hot Water Outlet/Anode 17 BN Burner Only Cold Water Inlet Tube 18 Main Burner Orifice Flue Baffle 19 Pilot Assembly T&P Relief Valve... - Page 40 Email parts@bradfordwhite.com techserv@bradfordwhite.com www.bradfordwhite.com...